Surfactant selection for enhancing ex situ soil washing

Deshpande, Shruti; Shiau, Bor-Jier; Wade, Donald W.; Sabatini, David A.; Harwell, Jeffrey H.

doi:10.1016/s0043-1354(98)00234-6

Cited by 253 publications

(163 citation statements)

References 13 publications

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“…The Fig. 8 shows that the 71, S* relation can be assumed to be of the form Ymin = KS (S * -b) (10) where, KS is the slope of the straight line; b is the abscissa of the intersection between this line and horizontal axis. b value represents the optimal salinity at which the system becomes one-phase microemulsion (Ymin = 0).…”

Section: Resultsmentioning

confidence: 99%

Effect of Alcohol and Oil Type on Minimum Interfacial Tensions and Phase Behavior of the Brine/Surfactant/Alcohol/Oil Systems

Tien¹,

Bettahar²,

Matsubayashi³

2000

Doboku Gakkai Ronbunshu

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The middle-phase microemulsion potentially for oil recovery is often produced by using alcohol as a co-surfactant. The objective of this study is to connect the changes of this middle-phase with the resulting minimum interfacial tensions upon adding the alcohol to the systems containing brine, an anionic surfactant and different alkanes. The results demonstrated a reduction in the interfacial tensions with either increasing alcohol concentration or decreasing the alkane carbon number. The observed trends were expressed by a simple correlation between the minimum interfacial tensions and optimal salinities. This correlation can be used to select the optimum surfactant/alcohol formulations for soil remediation.

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Section: Resultsmentioning

confidence: 99%

Effect of Alcohol and Oil Type on Minimum Interfacial Tensions and Phase Behavior of the Brine/Surfactant/Alcohol/Oil Systems

Tien¹,

Bettahar²,

Matsubayashi³

2000

Doboku Gakkai Ronbunshu

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“…The first mechanism, 'separation', occurs below the CMC when surfactant monomers increase the contact angle between the soil and the hydrophobic contaminant. The other mechanism, 'solubilization', occurs above the CMC when contaminants are partitioned from the soil into the hydrophobic core of surfactant micelles (Deshpande et al, 1999). With these processes, a surfactant can increase the solubility of organic contaminants or lower the interfacial tension to enhance the mobility of the organic contaminants (West and Harwell, 1992 (Paria, 2008;Khalladi et al, 2009;Huguenot et al, 2015).…”

Section: Surfactantsmentioning

confidence: 99%

“…Among a number of physical and chemical remediation processes, soil washing has been proposed as a promising innovative remediation technology due to its potential for treating not only oil contaminated soils but also those contaminated by heavy metals (Deshpande et al, 1999;Mulligan et al, 2001;Urum et al, 2004). During this process, the washing solution extracts and separates contaminants from the soil, thereby reducing the quantity of contaminant for further treatment (Griffiths, 1995).…”

Section: Introductionmentioning

confidence: 99%

Surfactant-enhanced Soil Washing using Tween and Tergitol Series Surfactants for Kuwait Soil Heavily Contaminated with Crude Oil

Heo¹,

Lee²

2015

Journal of Soil and Groundwater Environment

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Batch experiments were performed to investigate the feasibility of a surfactant-enhanced soil washing process for soils heavily contaminated with crude oil in Kuwait. TPH concentration of the contaminated soil was 223,754 mg/kg, sampled from the bottom of a vaporized oil extraction pond in the Burgan reservoir field. Commercialized eight nonionic surfactants (Tween and Tergitol series) were used to measure the aqueous solubility for the crude oil. Among them, two Tergitol surfactants were used to evaluate the TPH removal efficiency of the surfactant-enhanced soil washing for heavily contaminated Kuwait soil. The solubility of the crude oil in surfactant solution was in the order Tergitol 15-S-7 > Tergitol 15-S-9 > Tergitol 15-S-12 > Tween-80 > Tween-20 > Tween-60, which showed that the crude oil solubilities of the Tergitol series were higher than those of the Tween series. The TPH removal efficiencies of 2% and 5% Tergitol 15-S-9 solution were 59% and 65%, respectively. Because the residual TPH concentration in the washed soil was still higher than the clean-up level (10,000 mg/kg), the soil washing process was repeated five times. After the fifth washing, the residual TPH concentration in the soil went down to 7,680 mg/kg and its removal efficiency was 97%.

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“…Surfactant-enhanced soil remediation (SESR) has long been known as the most effective and promising technique for the removal of hydrophobic pollutants from soil and water [5][6][7][8]. The selection of suitable surfactants to be employed in soil washing is a very important task for the successful application of SESR technology [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Solubilization and adsorption behaviors of 2,4,6-trichlorophenol in the presence of surfactants

Zeng

Peng

Liu

et al. 2013

Chemical Engineering Journal

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h i g h l i g h t sThe solubility of 2,4,6-trichlorophenol was enhanced 72 times by sodium deoxycholateat pH 7.5. NaDC demonstrated the best solubilization potential, followed by NaC, SDS and b-CD. The adsorption of 2,4,6-trichlorophenol was almost zero when NaC concentration was above CMC 2 . a r t i c l e i n f o t r a c tThe solubilization of 2,4,6-trichlorophenol (2,4,6-TCP) was studied in the presence of four different surfactants, namely sodium deoxycholate (NaDC), sodium cholate (NaC), sodium lauryl sulfate (SDS) and bcyclodextrin (b-CD). The solubility of 2,4,6-TCP was enhanced a maximum of 72 times especially by NaDC at pH 7.5. In addition, other than great solubilization capacities, NaDC and NaC have the advantages of high biodegradability and biocompatibility as biosurfactants. The adsorption behaviors of 2,4,6-TCP on the surface of soil in the presence of these solubilizers were examined. The results showed that the adsorption isotherms for all studied surfactants matched the Henry adsorption isotherm well. The adsorption mechanisms were explored and the adsorption behaviors of 2,4,6-TCP were affected by different micelle forms of the surfactants based on their critical micelle concentration (CMC). The adsorption process was demonstrated by a redistribution procedure between surfactants in solution and surfactants adsorbed onto the soil surface. In particular, the adsorption of 2,4,6-TCP was almost zero when NaC concentration was above CMC 2 .The results of our study have important implications for soil remediation and non-point source pollution control.

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Surfactant selection for enhancing ex situ soil washing

Cited by 253 publications

References 13 publications

Effect of Alcohol and Oil Type on Minimum Interfacial Tensions and Phase Behavior of the Brine/Surfactant/Alcohol/Oil Systems

Effect of Alcohol and Oil Type on Minimum Interfacial Tensions and Phase Behavior of the Brine/Surfactant/Alcohol/Oil Systems

Surfactant-enhanced Soil Washing using Tween and Tergitol Series Surfactants for Kuwait Soil Heavily Contaminated with Crude Oil

Solubilization and adsorption behaviors of 2,4,6-trichlorophenol in the presence of surfactants

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